Yes I went to the single Mikuni because the Amals were just hanging on the bike when I got it. I am in the process of rebuilding the motor right now and will go back to dual carbs but they will be flat slide PWK's. The complete motor except for the crank and cylinder will be changed. This is whats going inside; FullAuto head, JS light weight pistons, JS designed Carrillo rods, JS stage one cam with light weight lifters, JS custom valve springs and push rods, Comstock breather, and a bunch of little things that just make things better!

My mates had a lot of issues with his Mikuni. It keeps flooding for no apparent reason. Take it apart clean it out, put it back together and it'll be ok for a short period of time and then start flooding again. All I can attribute it too is small parts of grit in the fuel. Nothing ever appears when it's cleaned out though.

Lower the float, mine was very sensitive to this also. I got mine from Sudco and it was supposed to be all ready to bolt on, no way! I had to change everything, the slide, needle, main jet and slow jet. It turned my pipes bright blue right away. A friend's bike leaked also, we found the bowl didn't have an overflow drain so the gas would fill the bowl then run back into the air cleaner soak it and then drip off the air cleaner. Good luck.

My mates had a lot of issues with his Mikuni. It keeps flooding for no apparent reason. Take it apart clean it out, put it back together and it'll be ok for a short period of time and then start flooding again. All I can attribute it too is small parts of grit in the fuel. Nothing ever appears when it's cleaned out though.

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Easy enough to put in-line filters on.
Could it be the enricher O-rings, maybe not seating properly? If that is a Mikuni MKIII knock-off, with an enricher lever, take a look down there to see if the o-rings are seating properly. I had a T140E with the MKIIIs on, and it ran rich forever, until I finally replaced those O-rings. Just a thought.

Yes the brakes are from Colorado Norton Works, Brembo front and back and master cylinder units. The wheels are Excel and I laced and trued them my self. First time I have attempted this and it was hard because of the crazy off-sets that Norton uses. This bike also has a hydraulic clutch unit in the tranny that was also from CNW.